benchtests/bench-memchr.c

   1 /* Measure memchr functions.
   2    Copyright (C) 2013-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef WIDE
  20 # define CHAR char
  21 # define SMALL_CHAR 127
  22 #else
  23 # include <wchar.h>
  24 # define CHAR wchar_t
  25 # define SMALL_CHAR 1273
  26 #endif /* WIDE */
  27
  28 #ifndef USE_AS_MEMRCHR
  29 # define TEST_MAIN
  30 # ifndef WIDE
  31 #  define TEST_NAME "memchr"
  32 # else
  33 #  define TEST_NAME "wmemchr"
  34 # endif /* WIDE */
  35 # include "bench-string.h"
  36
  37 # ifndef WIDE
  38 #  define MEMCHR memchr
  39 #  define SIMPLE_MEMCHR simple_memchr
  40 # else
  41 #  define MEMCHR wmemchr
  42 #  define SIMPLE_MEMCHR simple_wmemchr
  43 # endif /* WIDE */
  44
  45 typedef CHAR *(*proto_t) (const CHAR *, int, size_t);
  46 CHAR *SIMPLE_MEMCHR (const CHAR *, int, size_t);
  47
  48 IMPL (SIMPLE_MEMCHR, 0)
  49 IMPL (MEMCHR, 1)
  50
  51 CHAR *
  52 SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)
  53 {
  54   while (n--)
  55     if (*s++ == (CHAR) c)
  56       return (CHAR *) s - 1;
  57   return NULL;
  58 }
  59 #endif /* !USE_AS_MEMRCHR */
  60
  61 static void
  62 do_one_test (impl_t *impl, const CHAR *s, int c, size_t n, CHAR *exp_res)
  63 {
  64   CHAR *res = CALL (impl, s, c, n);
  65   size_t i, iters = INNER_LOOP_ITERS;
  66   timing_t start, stop, cur;
  67
  68   if (res != exp_res)
  69     {
  70       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  71              res, exp_res);
  72       ret = 1;
  73       return;
  74     }
  75
  76   TIMING_NOW (start);
  77   for (i = 0; i < iters; ++i)
  78     {
  79       CALL (impl, s, c, n);
  80     }
  81   TIMING_NOW (stop);
  82
  83   TIMING_DIFF (cur, start, stop);
  84
  85   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  86 }
  87
  88 static void
  89 do_test (size_t align, size_t pos, size_t len, int seek_char)
  90 {
  91   size_t i;
  92   CHAR *result;
  93
  94   align &= 7;
  95   if ((align + len) * sizeof (CHAR) >= page_size)
  96     return;
  97
  98   CHAR *buf = (CHAR *) (buf1);
  99
 100   for (i = 0; i < len; ++i)
 101     {
 102       buf[align + i] = 1 + 23 * i % SMALL_CHAR;
 103       if (buf[align + i] == seek_char)
 104         buf[align + i] = seek_char + 1;
 105     }
 106   buf[align + len] = 0;
 107
 108   if (pos < len)
 109     {
 110       buf[align + pos] = seek_char;
 111       buf[align + len] = -seek_char;
 112       result = (CHAR *) (buf + align + pos);
 113     }
 114   else
 115     {
 116       result = NULL;
 117       buf[align + len] = seek_char;
 118     }
 119
 120   printf ("Length %4zd, alignment %2zd:", pos, align);
 121
 122   FOR_EACH_IMPL (impl, 0)
 123     do_one_test (impl, (CHAR *) (buf + align), seek_char, len, result);
 124
 125   putchar ('\n');
 126 }
 127
 128 int
 129 test_main (void)
 130 {
 131   size_t i;
 132
 133   test_init ();
 134
 135   printf ("%20s", "");
 136   FOR_EACH_IMPL (impl, 0)
 137     printf ("\t%s", impl->name);
 138   putchar ('\n');
 139
 140   for (i = 1; i < 8; ++i)
 141     {
 142       do_test (0, 16 << i, 2048, 23);
 143       do_test (i, 64, 256, 23);
 144       do_test (0, 16 << i, 2048, 0);
 145       do_test (i, 64, 256, 0);
 146     }
 147   for (i = 1; i < 32; ++i)
 148     {
 149       do_test (0, i, i + 1, 23);
 150       do_test (0, i, i + 1, 0);
 151     }
 152
 153   return ret;
 154 }
 155
 156 #include <support/test-driver.c>